CN102695286B - Network allocation vector repositioning method and device - Google Patents
Network allocation vector repositioning method and device Download PDFInfo
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Abstract
The invention provides a kind of network allocation vector repositioning method and device.This method includes：Wireless site receives radio frames, wherein, the radio frames carry time span configured information；The wireless site updates local NAV according to time span configured information；The wireless site judges whether the Frame switch sequence that radio frames are initiated sends failure, if it fails, resetting NAV.According to the present invention, when solving the failure of Frame switch sequence, the problem of each website is unable to fair competition channel so that each wireless site can participate in channel competition faster, and then improve the utilization rate of channel.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of network allocation vector (Network Allocation
Vector, NAV) repositioning method and device.
Background technology
At present, in field of wireless, WLAN (Wireless Local Area Network, WLAN) is quick
Development, requires growing to the demand that WLAN is covered, requirement to handling capacity also more and more higher.Electrical and Electronic engineer assists
802.11a can be successively defined in industrial specification IEEE802.11 groups, 802.11b, the series of standards such as 802.11g is most common
WLAN technologies, then again occur in that other task groups successively, be directed to developing the specification for being related to existing 802.11 technological improvement,
For example, 802.11n task groups propose the requirement of high-throughput (High Throughput, abbreviation HT), support to be up to 600Mbps
Data rate, 802.11ac task groups are it is further proposed that VHT (Very High Throughput) concept, by introducing more
Data rate lifting is arrived 1Gbps by big channel width.New agreement needs the agreement before backward compatibility.
In 802.11, an access point (Access Point, abbreviation AP) and the multiple websites associated with AP
(Station, abbreviation STA) constitutes a Basic Service Set (Basic Service Set, abbreviation BSS).802.11 define
Two kinds of operator schemes：Distributed coordination function (Distributed Coordination Function, abbreviation DCF) and point association
Conditioning function (Point Coordination Function, abbreviation PCF), and for the improvement of both operator schemes：Enhancing
Type distributed coordination access function (Enhanced Distributed Channel Access, abbreviation EDCA) and mixing are coordinated
Function control channel access function (Hybrid Coordination function Controlled channel Access,
Abbreviation HCCA).Wherein, DCF is most basic operator scheme, utilizes the Carrier Sense Multiple Access mechanism with conflict avoidance
(Carrier Sense Multiple Access with Collision Avoidance, CSMA/CA) is total to multiple websites
Enjoy wireless channel.EDCA is enhanced kind of operation pattern, using CSMA/CA mechanism, makes multiple different priorities queue sharings wireless
Channel, and preengage a transmission opportunity (Transmission Opportunity, abbreviation TXOP).
During multiple wireless site shared channels, the collision detection of wireless environment becomes extremely difficult, wherein once big problem
It is to hide website.Hide website example as shown in figure 1, website A to B send data, while website C also to B send data, due to
C and A each other all in the coverage of other side outside, A and C send and will led to a conflict simultaneously.From the perspective of A, C is one
Individual hiding website.To solve to hide station problem, 802.11 propose pseudo channel testing mechanism, i.e., by radio frames frame head
In include reserve channel time information, other receive the radio frames containing time reservation information audit website set locally deposit
One network allocation vector of storage, NAV value is set to the maximum of above-mentioned time reservation information, within the time, audited
Website will not send data, so as to avoid concealed nodes competitive channel, cause collision.After NAV is kept to zero, other website ability
Send data.For example sender sends RTS (Request to send) frame and carries out channel booking, wherein during comprising channel booking
Between information, recipient response CTS (Clear to send) frame carry out channel booking confirmation, wherein also include the channel booking time
Information, to ensure that sender can complete Frame switch.RTS/CTS application method schematic diagrames are as shown in Figure 2.
Frame switch sequence is defined in order to carry out channel information collection, specifically, channel information collection side
(beamformer) NDPA (Null Data Packet Announcement, empty packet is notified) frame is sent, and in NDPA knots
The short interFrameGap (SIFS) of beam sends NDP (Null Data Packet, empty packet) afterwards, and being indicated in NDPA needs to survey
The first feedback of channel information side (beamformee) indicated in the website of simultaneously feedback channel information, NDPA is measured to finish receiving
Acquiescence replys channel feedback information after NDPA and NDP SIFS, and first channel feedback information is abbreviated as 1stSND FB (1st
Sounding Feedback), if multiple channel feedback sides, in addition to first feedback side's acquiescence feedback, other channel informations
Feedback side waits the poll (Sounding Poll) of channel information collection side to carry out feedback channel information.Current WLAN is appointed
Business group regulation NDPA-NDP-1stSND FB are used as an effective Frame switch sequence.
During the first Frame switch sequence that NDPA-NDP-1stSND FB start as TXOP, if feedback frame is not returned successfully
Return, then the STA for sending NDPA and NDP thinks that TXOP obtains failure, keep out of the way rule competitive channel again according to existing.For this
Website is audited around transmitting station, its NAV will be set after NDPA is heard, if these STAs NAV does not reset (this
In reset refer to set to 0), send STA around website of auditing be unable to competitive channel before NAV terminates.In this case, transmitting station
The recovery from error of transmission that can be quickly is competed, and channel competition can not be participated within the time that NAV is not zero by auditing website,
Cause to access between website the unfairness of channel.
When failing for Frame switch sequence in correlation technique, the problem of each website is unable to fair competition channel, at present still
Effective solution is not proposed.
The content of the invention
It is above-mentioned at least to solve it is a primary object of the present invention to provide a kind of network allocation vector repositioning method and device
When Frame switch sequence fails, the problem of each website is unable to fair competition channel.
According to an aspect of the invention, there is provided a kind of network allocation vector repositioning method, including：Wireless site is received
Radio frames, wherein, the radio frames carry time span configured information；The wireless site updates according to time span configured information
Local NAV；The wireless site judges whether the Frame switch sequence that radio frames are initiated sends failure, if it fails, resetting NAV.
According to another aspect of the present invention there is provided a kind of network allocation vector resetting means, the device is arranged on wirelessly
On website, including：Receiving module, for receiving radio frames, wherein, the radio frames carry time span configured information；Update
Module, local NAV is updated for the time span configured information in the radio frames that are received according to receiving module；Reseting module, is used
In judging whether the Frame switch sequence that radio frames are initiated sends failure, if it fails, resetting the NAV after update module updates.
By the present invention, whether wireless site is failed by judging that current Frame switch sequence is sent, and it is determined that failure
In the case of, local NAV is resetted in advance, without being resetted again until the duration arrival that NAV is set, which is solved
When Frame switch sequence fails, the problem of each website is unable to fair competition channel so that each wireless site can be participated in faster
Channel competition, and then improve the utilization rate of channel.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, this hair
Bright schematic description and description is used to explain the present invention, does not constitute inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is the hiding website schematic diagram according to correlation technique；
Fig. 2 is the RTS/CTS application method schematic diagrames according to correlation technique；
Fig. 3 is the flow chart of according to embodiments of the present invention 1 NAV repositioning methods；
Fig. 4 is that the NAV according to embodiments of the present invention 2 NDPA-NDP-1stSND FB Frame switch resets schematic diagram；
Fig. 5 be according to embodiments of the present invention 5 use PLCP frame heads in L-SIG be transmitted protection NAV reset signal
Figure；
Fig. 6 is the structured flowchart of according to embodiments of the present invention 8 NAV resetting means.
Embodiment
Describe the present invention in detail below with reference to accompanying drawing and in conjunction with the embodiments.It should be noted that not conflicting
In the case of, the feature in embodiment and embodiment in the application can be mutually combined.
The embodiment of the present invention as far as possible ensure fair competition channel principle under, when Frame switch sequence (for example：NDPA-
NDP-1stSND FB) send after failure, the website for ensuring to have set NAV by certain mechanism carries out NAV resets in time, so that
The website can participate in channel competition.Based on this, a kind of NAV repositioning methods and device are present embodiments provided.
Embodiment 1
A kind of NAV repositioning methods are present embodiments provided, referring to Fig. 3, this method comprises the following steps：
Step S302, wireless site receives radio frames, wherein, the radio frames carry time span configured information, that is, refer to
The radio frames include or indicated time span；
The radio frames are one or more radio frames that sender is used to obtain the transmission of current transmission chance, can be NDPA
Frame or poll (Sounding Poll) frame；Wireless site refers to needs according in NDPA or Sounding Poll frames
Information updating NAV website, for example, transceiver station audits website.
Step S304, the wireless site updates local NAV according to above-mentioned time span configured information；
The present embodiment NAV specific update method may be referred to correlation technique realization, and I will not elaborate；
Step S306, the wireless site judges whether the Frame switch sequence that above-mentioned radio frames are initiated sends failure, if
Failure, resets above-mentioned NAV.
The wireless site of the present embodiment judges that the Frame switch sequence that above-mentioned radio frames are initiated is not present and sends asking for failure
During topic, then NAV need not be resetted.
Frame switch sequence in the present embodiment can at least include following three part：
1) one or more radio frames that sender sends, for example：NDPA, NDP or Sounding Poll frames etc.；
2) one or more response frame of recipient's feedback, for example：1stSND FB, SND FB or ACK etc.；
3) time interval of two adjacent wireless interframe.
Based on above-mentioned three part, Frame switch sequence can be that sender's transmission NDPA frames are retransmited after interframe space
NDP, recipient feeds back 1stSND FB by interframe space after NDP is received or sender sends Poll frames, connects
Debit is sent after NDPA frames by interframe space after Poll frames are received by an interval feedback SND FB frame, or for sender
NDP is retransmited, recipient is received after NDP by the one or more response frames of interframe space feedback.Initiate the nothing of Frame switch sequence
Line frame is the radio frames sent by sender in above-mentioned Frame switch sequence.Response frame refers to that recipient receives and initiates asking in frame
After asking, the radio frames of recipient's feedback.
The wireless site of the present embodiment judges the Frame switch sequence that above-mentioned radio frames are initiated by way of detecting channel
Whether row send failure, for example：At the appointed time to channel, (channel refers between the wireless site and sender wireless site in section
Channel) detected, when testing result indicates that channel is at the appointed time in idle condition in section all the time, the wireless site
Determine that the Frame switch sequence that above-mentioned radio frames are initiated sends failure；Wherein, idle condition here refers to the physics of wireless site
Layer receives the channel signal strength not up to threshold value that the report of radio frames and/or wireless site are detected without generation.
Carved at the beginning of the above-mentioned specified period and time span is one below：
1) one or more radio frames that the initiation detected for the wireless site is shaken hands are carved at the beginning of specifying the period
At the time of all sending end, transmission time, interframe space and time of the time span including response frame of period is specified to prolong
Slow Δ t；
2) it is last the non-radio frame transmission finish time shaken hands for initiation to be carved at the beginning of specifying the period, is referred to
Radio frame transmission time that the transmission time of the time span for section of fixing time including response frame, being used for of not sending initiate to shake hands,
Interframe space and time delay Δ t；
3) it is the response frame end of transmission moment to be carved at the beginning of specifying the period, specifies the time span of period and includes frame
Between interval and time delay Δ t；
Wherein, the transmission time of above-mentioned response frame refers to wireless site calculating or that the recipient that makes an appointment sends one
Or the transmission time of multiple response frames；Above-mentioned time delay Δ t includes frame transfer delay and processing postpones, above-mentioned interframe space
Refer to the time interval of two adjacent wireless interframe.
The NAV repositioning methods of the present embodiment are applied to the Frame switch of one response of multiple requests, the multiple responses of request
Frame switch, and the multiple responses of multiple requests Frame switch scene.
Whether the wireless site of the present embodiment failed by judging that current Frame switch sequence is sent, and it is determined that failure
In the case of, local NAV is resetted in advance, without being resetted again until the duration arrival that NAV is set, which solves frame
When turnaround sequence fails, the problem of each website is unable to fair competition channel so that each wireless site can participate in letter faster
Road is competed, and then improves the utilization rate of channel.
Embodiment 2
A kind of NAV repositioning methods are present embodiments provided, the Frame switch sequence of the present embodiment is with NDPA-NDP-1stSND
Illustrated exemplified by FB.Referring to Fig. 4 NAV reset schematic diagram, transmitting station competition win after when trying to TXOP, send
NDPA frames send NDP as first frame, and after NDPA frames after the SIFS times, the first feedback website acquiescence of NDPA marks is in NDP
Fed back after SIFS after end, receiving-transmitting sides obtain TXOP by NDPA-NDP-1stSND FB Frame switch.Here
1stSND FB can be free from the response frame Null FB frames of feedback information.
Audit website and that correctly received NDPA frames, the NAV of oneself is provided with by the information of NDPA frames, if this audits station
In the specified period after the NDP ends of transmission of point in NDPA and thereafter, do not receive physical layer and start to receive primitive PHY-
RXSTART.indication (that is, physical layer does not produce the report for receiving radio frames), then this is audited website and can answered
The position NAV of oneself.Wherein, the specified period of the present embodiment refer to (2 × aSIFSTime)+(1stSND FB_Time)+(2 ×
ASlotTime) in+aPHY-RX-START-Delay times；Wherein, 1stSND FB_Time refer to audit website needs according to
The first feedback transmission time (maximum is taken when being unable to estimate) that information estimation in NDPA frames is drawn, aSIFSTime is short frame
Between interval time, aPHY-RX-START-Delay be physical layer receive starts delay, aSlotTime refer to WLAN regulation
A time slot time.Here when auditing website and not receiving effective NDP, the NDP end of transmission moment is audits website
The end of transmission moment drawn according to NDP frame length calculations.
The present embodiment audit website (2 × aSIFSTime)+(1stSND FB_Time)+(2 × aSlotTime)+
In the aPHY-RX-START-Delay times, it does not receive physical layer and starts to receive primitive PHY-RXSTART.indication,
Thus this is audited website and determines that current NDPA-NDP-1stSND FB Frame switch sends failure, in order to participate in channel in time
Competition, and its NAV is resetted.When which solves the failure of Frame switch sequence, each website is unable to asking for fair competition channel
Topic so that each wireless site can participate in channel competition faster, and then improve the utilization rate of channel.
Embodiment 3
A kind of NAV repositioning methods are present embodiments provided, the Frame switch sequence of the present embodiment is entered by taking Poll-SND FB as an example
Row explanation.Transmitting station competition is won, when trying to TXOP, is sent (Sounding) Poll frames and is used as first frame, Poll frames
The feedback website of middle mark is fed back after the SIFS after Poll frame ends, and receiving-transmitting sides pass through Poll-SND FB Frame switch
Obtain TXOP.
Audit website and that correctly received Poll frames, the NAV of oneself is provided with by the information of Poll frames, if this audits station
(2 × aSIFSTime)+(SND FB_Time)+(2 × aSlotTime)+aPHY-RX- of the point after the Poll frame ends of transmission
In the START-Delay times (the specified period i.e. in embodiment 1), do not receive physical layer and start to receive primitive PHY-
RXSTART.indication, then this, which audits website, can reset the NAV of oneself.Here SND FB_Time refer to audit station
Point needs the feedback SND FB transmission times (maximum is taken when being unable to estimate) that the information estimation in Poll frames is drawn；The public affairs
The implication of other variables is same as the previously described embodiments in formula.
The present embodiment audits website in (2 × aSIFSTime)+(SND FB_Time)+(2 × aSlotTime)+aPHY-
In the RX-START-Delay times, it does not receive physical layer and starts to receive primitive PHY-RXSTART.indication, thus
This is audited website and determines that current Poll-SND FB Frame switch sends failure, in order to participate in channel competition in time, and by its
NAV resets.When which solves the failure of Frame switch sequence, the problem of each website is unable to fair competition channel so that each nothing
Line website can participate in channel competition faster, and then improve the utilization rate of channel.
Embodiment 4
A kind of NAV repositioning methods are present embodiments provided, the Frame switch sequence of the present embodiment is with NDPA-NDP-1stSND
Illustrated exemplified by FB.Transmitting station competition win after when trying to TXOP, NDPA frames are sent as first frame, and in NDPA
NDP is sent after frame after the SIFS times, the first feedback website acquiescence of NDPA marks is fed back after the SIFS after NDP terminates,
Receiving-transmitting sides obtain TXOP by NDPA-NDP-1stSND FB Frame switch.
Audit website and that correctly received NDPA frames, the NAV of oneself is provided with by the information of NDPA frames, if this audits station
Point (is implemented in (aSIFSTime)+(the aSlotTime)+aPHY-RX-START-Delay times after the NDPA ends of transmission
The specified period in example 1), the implication of each variable is same as the previously described embodiments in the formula.There is no physical layer to start to receive former
Language PHY-RXSTART.indication has PHY-RXSTART.indication primitive but does not receive effective NDP
(that is, physical layer does not produce the report for receiving radio frames), then this, which audits website, can reset the NAV of oneself.
The present embodiment audits website in (aSIFSTime)+(the aSlotTime)+aPHY-RX-START-Delay times
Interior, its physical layer does not produce the report for receiving radio frames, thus this is audited website and determines current NDPA-NDP-1stSND
FB Frame switch sends failure, in order to participate in channel competition in time, and its NAV is resetted.Which solves Frame switch sequence
During row failure, the problem of each website is unable to fair competition channel so that each wireless site can participate in channel competition faster,
And then improve the utilization rate of channel.
Embodiment 5
A kind of NAV repositioning methods are present embodiments provided, the Frame switch sequence of the present embodiment is with NDPA-NDP-1stSND
Illustrated exemplified by FB.Transmitting station competition win after when trying to TXOP, NDPA frames are sent as first frame, and in NDPA
NDP is sent after frame after the SIFS times, the first feedback website acquiescence of NDPA marks is fed back after the SIFS after NDP terminates,
Receiving-transmitting sides obtain TXOP by NDPA-NDP-1stSND FB Frame switch.
Audit website and that correctly received NDPA frames, NDPA-NDP- can accurately be calculated by the information of NDPA frames
1stSND FB Frame switch finish times, and audit website determine it is first feedback website feedback frame transmission not over the knot
The beam moment, then audit the aSIFSTime+ after website reaches in the finish time of NDPA-NDP-1stSND FB Frame switch (2 ×
ASlotTime) (the specified period i.e. in embodiment 1) in+aPHY-RX-START-Delay times, PHY- is not received
RXSTART.indication primitive, then this, which audits website, can reset the NAV of oneself.In the formula implication of each variable with
Above-described embodiment is identical.
The present embodiment audits website in aSIFSTime+ (2 × aSlotTime)+aPHY-RX-START-Delay times
It is interior, PHY-RXSTART.indication primitive is not received, thus this is audited website and determines current NDPA-NDP-1stSND
FB Frame switch sends failure, in order to participate in channel competition in time, and its NAV is resetted.Which solves Frame switch sequence
During row failure, the problem of each website is unable to fair competition channel so that each wireless site can participate in channel competition faster,
And then improve the utilization rate of channel.
Embodiment 6
A kind of NAV repositioning methods are present embodiments provided, the Frame switch sequence of the present embodiment is with NDPA-NDP-1stSND
Illustrated exemplified by FB.Transmitting station competition win after when trying to TXOP, NDPA frames are sent as first frame, and in NDPA
NDP is sent after frame after the SIFS times, the first feedback website acquiescence of NDPA marks is fed back after the SIFS after NDP terminates,
Receiving-transmitting sides obtain TXOP by NDPA-NDP-1stSND FB Frame switch.Here 1stSND FB can be free from feedback information
Response frame Null FB frames.
Audit website and that correctly received NDPA frames, pass through the NAV of the information updating oneself of NDPA frames.And also make in NDPA frames
With other safeguard measures requirement audit website will not within the NDPA-NDP-1stSND FB Frame switch duration competitive channel.
Further website of auditing can recognize this kind other safeguard measures, then if auditing website other protection mechanisms in NDPA
The finish time of the NDPA-NDP-1stSND FB Frame switch of mark reach after aSIFSTime+ (2 × aSlotTime)+
In the aPHY-RX-START-Delay times (the specified period i.e. in embodiment 1), PHY- is not received
RXSTART.indication primitive, then this, which audits website, can reset the NAV of oneself.In the formula implication of each variable with
Above-described embodiment is identical.Use PLCP (Physical Layer Convergence Protocol, physical layer as shown in Figure 5
Convergence protocol) L-SIG (Link SIGnature, link identification) in frame head is transmitted the situation of protection.
The present embodiment audits website in aSIFSTime+ (2 × aSlotTime)+aPHY-RX-START-Delay times
It is interior, PHY-RXSTART.indication primitive is not received, thus this is audited website and determines current NDPA-NDP-1stSND
FB Frame switch sends failure, in order to participate in channel competition in time, and its NAV is resetted.Which solves Frame switch sequence
During row failure, the problem of each website is unable to fair competition channel so that each wireless site can participate in channel competition faster,
And then improve the utilization rate of channel.
Embodiment 7
Present embodiments provide a kind of NAV repositioning methods, the Frame switch sequence of the present embodiment with " NDPA-NDP- response frames-
Illustrated exemplified by response frame ".Transmitting station competition win after when trying to TXOP, send NDPA frames as first frame, and
The multiple wireless sites for being identified in NDP, NDPA and needing to respond NDPA are sent after the SIFS times after NDPA frames, are received
Square wireless site is according to the identification information position of NDPA frames oneself, order reply response frame.For example when the website identified in NDPA
When number is 2, receiving-transmitting sides obtain transmission opportunity by " NDPA-NDP- response frames-response frame ", and by Frame switch to dispatching station
Data transfer between point and two receiving stations is protected.When sender does not receive any one significant response frame,
Sender abandons transmission opportunity, otherwise, and sender carries out next step transmission.Here response frame can be the shorter response such as ACK
Frame.
Audit website and that correctly received NDPA frames, pass through the NAV of the information updating oneself of NDPA frames.Audit website and find receipts
Send out both sides and TXOP is obtained by " NDPA-NDP- response frames-response frame ", then audit 2 of website after NDP sends finish time
× aSIFSTime+2 × response frame transmission time+(implement in (3 × aSlotTime)+aPHY-RX-START-Delay times
The specified period in example 1), do not receive PHY-RXSTART.indication primitive, then this, which audits website, to reset
The NAV of oneself.
The present embodiment audit website 2 × aSIFSTime+2 × response frame transmission time+(3 × aSlotTime)+
In the aPHY-RX-START-Delay times, do not receive PHY-RXSTART.indication primitive, thus this to audit website true
The Frame switch of " NDPA-NDP- response frames-response frame " before settled sends failure, in order to participate in channel competition in time, and
Its NAV is resetted.When which solves the failure of Frame switch sequence, the problem of each website is unable to fair competition channel so that
Each wireless site can participate in channel competition faster, and then improve the utilization rate of channel.
Certainly, in above example, do not reached if auditing the channel signal strength that website at the appointed time detected in section
To threshold value, then it also will be considered that Frame switch sequence sends failure, and then local NAV is resetted.If at the appointed time
In section, auditing website, to detect channel once occupied, it is impossible to which oneself resets NAV, in order to avoid cause channel confliction.
Embodiment 8
A kind of network allocation vector resetting means is present embodiments provided, the device can be arranged on wireless site, joined
See Fig. 6, the device includes：
Receiving module 62, for receiving radio frames, wherein, the radio frames carry time span configured information；
Update module 64, is connected with receiving module 62, long for the time in the radio frames that are received according to receiving module 62
Spend configured information and update local NAV；
Reseting module 66, is connected with update module 64, for judging whether is Frame switch sequence that above-mentioned radio frames are initiated
Failure is sent, if it fails, resetting the NAV after update module updates.
Frame switch sequence in reseting module 66 at least includes following three part：1) sender send one or more
Radio frames, for example：NDPA, NDP or Sounding Poll frames etc.；2) one or more response frame of recipient's feedback, example
Such as：1stSND FB, SND FB or ACK etc.；3) time interval of two adjacent wireless interframe.
Based on above-mentioned three part, Frame switch sequence can be NDPA-NDP-1stSND FB or Poll-SND
FB, or be NDPA-NDP- response frames-response frame.The radio frames for initiating Frame switch sequence are by sending out in above-mentioned Frame switch sequence
The radio frames that the side of sending is sent.
Preferably, reseting module 66 includes：Detection unit, for being detected at the appointed time section to channel；It is determined that
Unit, is connected with detection unit, for empty when being in all the time in the testing result of detection unit instruction channel at the appointed time section
During not busy state, determine that the Frame switch sequence that above-mentioned radio frames are initiated sends failure；Wherein, the idle condition refers to wireless site
Physical layer does not produce the channel signal strength not up to thresholding that the report for receiving radio frames and/or detection unit are detected
Value.
When implementing, detection unit includes one below：
First detection sub-unit, is detected for being specified first in the period to channel, the first specified period
At the beginning of at the time of carve one or more radio frames that initiations detected for wireless site shake hands and all send end, this
One specifies the time span of period to include transmission time, interframe space and the time delay Δ t of response frame；
Second detection sub-unit, is detected for being specified second in the period to channel, the second specified period
At the beginning of to carve be second time for specifying the period for initiating last non-radio frame transmission finish time for shaking hands
The radio frame transmission time, interframe space and the time that are used to initiate to shake hands that length includes the transmission time of response frame, do not sent
Postpone Δ t；
3rd detection sub-unit, detects, the 3rd specifies the period for being specified the 3rd to channel in the period
At the beginning of carve be the response frame end of transmission moment, the 3rd specify the period time span include interframe space and time delay
Δt；
Wherein, the transmission time of response frame refer to wireless site calculating or that the recipient that makes an appointment sends one or
The transmission time of multiple response frames；Time delay Δ t includes frame transfer delay and processing postpones, and interframe space refers to two adjacent nothings
The time interval of line interframe.
Preferably, the receiving module of the present embodiment includes：Receiving unit, for receiving radio frames, the radio frames are transmission
Side is used for the one or more radio frames for obtaining the transmission of current transmission chance, can be NDPA frames or poll frame.
The device that the present embodiment is provided can be arranged on auditing in website in above-described embodiment 2-7, to make to audit station
Point can reset NAV in time according to actual conditions.
Whether the wireless site of the present embodiment failed by judging that current Frame switch sequence is sent, and it is determined that failure
In the case of, local NAV is resetted in advance, without being resetted again until the duration arrival that NAV is set, which solves frame
When turnaround sequence fails, the problem of each website is unable to fair competition channel so that each wireless site can participate in letter faster
Road is competed, and then improves the utilization rate of channel.
As can be seen from the above description, the wireless site of above example, can be in advance by this according to actual conditions
The NAV on ground resets, without being resetted again until the duration arrival that NAV is set, when solving the failure of Frame switch sequence, each station
The problem of point is unable to fair competition channel so that each wireless site can participate in channel competition faster, and then improve channel
Utilization rate.
Obviously, those skilled in the art should be understood that above-mentioned each module of the invention or each step can be with general
Computing device realize that they can be concentrated on single computing device, or be distributed in multiple computing devices and constituted
Network on, alternatively, the program code that they can be can perform with computing device be realized, it is thus possible to they are stored
Performed in the storage device by computing device, and in some cases, can be shown to be performed different from order herein
The step of going out or describe, they are either fabricated to each integrated circuit modules respectively or by multiple modules in them or
Step is fabricated to single integrated circuit module to realize.So, the present invention is not restricted to any specific hardware and software combination.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (8)
1. a kind of network allocation vector repositioning method, it is characterised in that including：
Wireless site receives radio frames, wherein, the radio frames carry time span configured information；
The wireless site updates local network allocation vector NAV according to the time span configured information；
The wireless site judges whether the Frame switch sequence that the radio frames are initiated sends failure, if it fails, resetting institute
State NAV；
Wherein, the wireless site, which judges whether Frame switch sequence that the radio frames are initiated sends, unsuccessfully includes：The nothing
Line website is at the appointed time detected in section to channel, when the testing result instruction channel begins within the specified period
When being in idle condition eventually, the wireless site determines that the Frame switch sequence that the radio frames are initiated sends failure, wherein, institute
State idle condition refer to the wireless site physical layer do not produce the report for receiving radio frames and/or the wireless site inspection
The channel signal strength measured not up to threshold value.
2. according to the method described in claim 1, it is characterised in that the Frame switch sequence at least includes following three part：
One or more radio frames that sender sends；
One or more response frame of recipient's feedback；
The time interval of two adjacent wireless interframe.
3. method according to claim 2, it is characterised in that the radio frames of the initiation Frame switch sequence are that the frame is handed over
Change the radio frames sent in sequence by sender.
4. according to the method described in claim 1, it is characterised in that carved at the beginning of the specified period and time span is
One below：
One or more radio frames that the initiation detected for the wireless site is shaken hands are carved at the beginning of the specified period
All send at the time of terminate, the time span of the specified period include the transmission time of response frame, interframe space and when
Between delay △ t；
It is last the non-radio frame transmission finish time shaken hands for initiation to be carved at the beginning of the specified period, described
Specify the transmission time of the time span including response frame of period, do not send when being used for the radio frame transmission for initiating to shake hands
Between, interframe space and time delay △ t；
It is the response frame end of transmission moment to be carved at the beginning of the specified period, and the time span of the specified period includes
Interframe space and time delay △ t；
Wherein, the transmission time of the response frame refer to that recipient that is that the wireless site is calculated or making an appointment sends one
Or the transmission time of multiple response frames；The time delay △ t include frame transfer delay and processing postpones, the interframe space
Refer to the time interval of two adjacent wireless interframe.
5. the method according to claim any one of 1-4, it is characterised in that the radio frames that the wireless site is received are hair
The side of sending is used for the one or more radio frames for obtaining the transmission of current transmission chance, and the radio frames are that empty packet notifies NDPA frames
Or poll frame.
6. a kind of network allocation vector resetting means, described device is arranged on wireless site, it is characterised in that including：
Receiving module, for receiving radio frames, wherein, the radio frames carry time span configured information；
Update module, local network is updated for the time span configured information in the radio frames that are received according to the receiving module
Allocation vector NAV；
Reseting module, for judging whether the Frame switch sequence that the radio frames are initiated sends failure, if it fails, resetting institute
State the NAV after update module updates；
Wherein, the reseting module includes：Detection unit, for being detected at the appointed time section to channel；Determining unit,
For when the testing result of the detection unit indicates that the channel is in idle condition all the time within the specified period,
Determine that the Frame switch sequence that the radio frames are initiated sends failure；Wherein, the idle condition refers to the thing of the wireless site
Reason layer does not produce the channel signal strength not up to thresholding that the report for receiving radio frames and/or the detection unit are detected
Value.
7. device according to claim 6, it is characterised in that the detection unit includes one below：
First detection sub-unit, detects, described first specifies the period for being specified first to channel in the period
At the time of start time is that one or more radio frames that the initiation that the wireless site is detected is shaken hands all send end, institute
Stating first specifies the time span of period to include transmission time, interframe space and the time delay △ t of response frame；
Second detection sub-unit, detects, described second specifies the period for being specified second to channel in the period
Start time is last non-radio frame transmission finish time for initiating to shake hands, and described second specifies the time of period
The radio frame transmission time, interframe space and the time that are used to initiate to shake hands that length includes the transmission time of response frame, do not sent
Postpone △ t；
3rd detection sub-unit, detects, the described 3rd specifies the period for being specified the 3rd to channel in the period
Start time is the response frame end of transmission moment, and the described 3rd specifies the time span of period to prolong including interframe space and time
Slow △ t；
Wherein, the transmission time of the response frame refer to that recipient that is that the wireless site is calculated or making an appointment sends one
Or the transmission time of multiple response frames；The time delay △ t include frame transfer delay and processing postpones, the interframe space
Refer to the time interval of two adjacent wireless interframe.
8. the device according to claim any one of 6-7, it is characterised in that the receiving module includes：
Receiving unit, for receiving radio frames, the radio frames are one that sender is used to obtain the transmission of current transmission chance
Or multiple radio frames, the radio frames are that empty packet notifies NDPA frames or poll frame.
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| CN104995983B (en) | 2013-02-15 | 2018-11-23 | Lg电子株式会社 | According to its bandwidth transmission/receiving frame method and apparatus in wlan system |
| CN103228056B (en) | 2013-04-24 | 2019-03-01 | 中兴通讯股份有限公司 | A kind for the treatment of method and apparatus of channel access |
| CN105828353A (en) * | 2015-01-08 | 2016-08-03 | 中兴通讯股份有限公司 | Hidden station (STA) detection method, hidden STA detection system and station |
| CN106550478B (en) * | 2015-09-22 | 2020-08-04 | 中兴通讯股份有限公司 | Method and device for setting multi-user transmission network distribution vector |
| CN105392207B (en) * | 2015-10-20 | 2018-12-28 | 魅族科技（中国）有限公司 | Communication means, device, access point and the website of WLAN |
| CN106060958A (en) * | 2016-05-30 | 2016-10-26 | 珠海市魅族科技有限公司 | Wireless local area network communication method, communication device and website |
| CN107659964A (en) * | 2016-07-26 | 2018-02-02 | 中兴通讯股份有限公司 | The method to set up and device of a kind of network allocation vector |
| CN117202369A (en) * | 2021-08-06 | 2023-12-08 | 华为技术有限公司 | Communication method, communication device, and computer-readable storage medium |
| CN114158064B (en) * | 2021-10-27 | 2023-07-14 | 深圳市联平半导体有限公司 | Communication equipment, network allocation vector adjustment method and system thereof and electronic equipment |
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| CN1996908A (en) * | 2005-12-31 | 2007-07-11 | 中兴通讯股份有限公司 | Method for ending time update and its state detection of occupied channels in the wireless LAN |
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| EP1626529A1 (en) * | 2003-05-16 | 2006-02-15 | Sony Corporation | Radio communication system, radio communication apparatus, radio communication method, and computer program |
| CN1996908A (en) * | 2005-12-31 | 2007-07-11 | 中兴通讯股份有限公司 | Method for ending time update and its state detection of occupied channels in the wireless LAN |
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